﻿/*
 * MD5加密
 * var md5 = new MD5();
 * var md5Pwd = md5.hex_md5(pwd).toUpperCase();
 */
function MD5(){

    this.hexcase = 0;
    this.b64pad  = "";
    this.chrsz   = 8;
    this.hex_md5      = function(s){ return this.binl2hex(this.core_md5(this.str2binl(s), s.length * this.chrsz));}
    this.b64_md5      = function(s){ return this.binl2b64(this.core_md5(this.str2binl(s), s.length * this.chrsz));}
    this.hex_hmac_md5 = function(key, data){ return this.binl2hex(this.core_hmac_md5(key, data)); }
    this.b64_hmac_md5 = function(key, data){ return this.binl2b64(this.core_hmac_md5(key, data)); }
    this.calcMD5      = function(s){ return this.binl2hex(this.core_md5(this.str2binl(s), s.length * this.chrsz));}


    this.core_md5 = function(x, len){

      x[len >> 5] |= 0x80 << ((len) % 32);
      x[(((len + 64) >>> 9) << 4) + 14] = len;
      var a =  1732584193;
      var b = -271733879;
      var c = -1732584194;
      var d =  271733878;
      for(var i = 0; i < x.length; i += 16){
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;

        a = this.md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
        d = this.md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
        c = this.md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
        b = this.md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
        a = this.md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
        d = this.md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
        c = this.md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
        b = this.md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
        a = this.md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
        d = this.md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
        c = this.md5_ff(c, d, a, b, x[i+10], 17, -42063);
        b = this.md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
        a = this.md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
        d = this.md5_ff(d, a, b, c, x[i+13], 12, -40341101);
        c = this.md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
        b = this.md5_ff(b, c, d, a, x[i+15], 22,  1236535329);
        a = this.md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
        d = this.md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
        c = this.md5_gg(c, d, a, b, x[i+11], 14,  643717713);
        b = this.md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
        a = this.md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
        d = this.md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
        c = this.md5_gg(c, d, a, b, x[i+15], 14, -660478335);
        b = this.md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
        a = this.md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
        d = this.md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
        c = this.md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
        b = this.md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
        a = this.md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
        d = this.md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
        c = this.md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
        b = this.md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
        a = this.md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
        d = this.md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
        c = this.md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
        b = this.md5_hh(b, c, d, a, x[i+14], 23, -35309556);
        a = this.md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
        d = this.md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
        c = this.md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
        b = this.md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
        a = this.md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
        d = this.md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
        c = this.md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
        b = this.md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
        a = this.md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
        d = this.md5_hh(d, a, b, c, x[i+12], 11, -421815835);
        c = this.md5_hh(c, d, a, b, x[i+15], 16,  530742520);
        b = this.md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
        a = this.md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
        d = this.md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
        c = this.md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
        b = this.md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
        a = this.md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
        d = this.md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
        c = this.md5_ii(c, d, a, b, x[i+10], 15, -1051523);
        b = this.md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
        a = this.md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
        d = this.md5_ii(d, a, b, c, x[i+15], 10, -30611744);
        c = this.md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
        b = this.md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
        a = this.md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
        d = this.md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
        c = this.md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
        b = this.md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

        a = this.safe_add(a, olda);
        b = this.safe_add(b, oldb);
        c = this.safe_add(c, oldc);
        d = this.safe_add(d, oldd);
      }
      return Array(a, b, c, d);

    }

    this.md5_cmn = function(q, a, b, x, s, t){
      return this.safe_add(this.bit_rol(this.safe_add(this.safe_add(a, q), this.safe_add(x, t)), s),b);
    }

    this.md5_ff = function(a, b, c, d, x, s, t){
      return this.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
    }

    this.md5_gg = function(a, b, c, d, x, s, t){
      return this.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
    }

    this.md5_hh = function(a, b, c, d, x, s, t){
      return this.md5_cmn(b ^ c ^ d, a, b, x, s, t);
    }

    this.md5_ii = function(a, b, c, d, x, s, t){
      return this.md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
    }

    this.core_hmac_md5 = function(key, data){
      var bkey = this.str2binl(key);
      if(bkey.length > 16) bkey = this.core_md5(bkey, key.length * this.chrsz);

      var ipad = Array(16), opad = Array(16);
      for(var i = 0; i < 16; i++){
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C;
      }

      var hash = this.core_md5(ipad.concat(this.str2binl(data)), 512 + data.length * this.chrsz);
      return this.core_md5(opad.concat(hash), 512 + 128);
    }

    this.safe_add =function(x, y){
      var lsw = (x & 0xFFFF) + (y & 0xFFFF);
      var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
      return (msw << 16) | (lsw & 0xFFFF);
    }

    this.bit_rol = function(num, cnt){
      return (num << cnt) | (num >>> (32 - cnt));
    }

    this.str2binl = function(str){
      var bin = Array();
      var mask = (1 << this.chrsz) - 1;
      for(var i = 0; i < str.length * this.chrsz; i += this.chrsz)
        bin[i>>5] |= (str.charCodeAt(i / this.chrsz) & mask) << (i%32);
      return bin;
    }

    this.binl2hex = function(binarray){
      var hex_tab = this.hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
      var str = "";
      for(var i = 0; i < binarray.length * 4; i++){
        str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
               hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
      }
      return str;
    }

    this.binl2b64 = function(binarray)
    {
      var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
      var str = "";
      for(var i = 0; i < binarray.length * 4; i += 3){
        var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
                    | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
                    |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
        for(var j = 0; j < 4; j++){
          if(i * 8 + j * 6 > binarray.length * 32) str += this.b64pad;
          else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
        }
      }
      return str;
    }

}